Acts as a manual thermostat, allowing you to by-pass the oil cooling system for cold-weather riding or for faster warm-ups on cool daysDurable anodized billet aluminum constructionKnurled grip knobWorks with all oil coolersCompact in-line installationMade in the USAIf oil hoses between the oil cooler and the oil source are too short, the oil cooler bypass valve may not fit in the oil lines Jagg bypass valves require at least 3'' of straight hose.